Motor propeller



IO. EVINRUDE MOTOR PRPELLER Origilnal Fil'ed May 19, 1921 Frag-1 3Sheets-Sheet 1 lll/lllA ATTORNEYS,

Feb. 3, O. EVINRUDE MOTOR PROPELLER Original Filed'May 19, 1921 3Sheets-Shoot z rWEA/role.- I

' ATTORNEYS.

Feb. 3, T925- y A o. EVINRUDE KOTOR PROPELLER Original Filed May 19,1921 3 Sheets-Shoot '5 INVENTOR.-

ATTORNESf l a1/MMM@ mm,

Patented Feb. 3, 1925.

UNITED STATES PATENT oFFlcE.

OLE EVINRUDE, F MILWAUKEE, WISCONSIN.

MOTOR PROPELLER.-

Application led May 19, 1921, Serial No. 470,998, VRenewed September 15,1924.

To all lwhom 'it may cof/wem.'

Be it known that I, OLE EVINRUDE, a citizen of the United States,residing at Milwaukee, in the countyof Milwaukee and State of Wisconsin,have invented certain new and useful Improvements in Motor Propellers,of which the following is a specification, reference being had to theaccompanying drawing, forming a part thereof.

This invention relates more particularly to outboard motor p`ropellerscomprising internal combustion engines for use on boats .v of variouskinds, particularly small orlight l peller post i craft such as rowboats, canoes, etc.

Its main objects are to utilize the profor conducting and dischargingthe exhaust from the motor or engine below the surface of the water, andincidentally for houslng the transmission connections between the engineand propeller wheel; to provide for locking the rudder swung forwardagainst or `close to one side of the propeller post for convenienceintransporting the motor propeller as a unit when detached from a boat; toprovide an adjustable yielding hinge or pivot connection between themotorl propeller. and a boat on which vit is mounted, which will permitthe propeller to Jswing rearwardly and upwardly and` clear obstructionswhich it may encounter and which would or.` mightl otherwise break orinjure -it and its supporting and Vdriving connections; and generally toimprove the `construction and operationof motor pro- Fig. 3 is a sideelevation ofthe steering and rudder locking head in connection withassociated parts, showing the rudder swung forward against or close tothe propeller post and locked in that position; Fig. 4 1s a. similarview showing the steering head in section' and raised out of engagementwith the rudder; Figs. 5, and 7 are horizontal sections on the lines5-5, 6-6 and 7-7 re# spectively, Fig. 1; and Fig. 8 is an enlargedlnverted plan view of the steering headjand associated parts'.

Referring .particularly to Figs. 1 and 2,

a typical internal combustion engine, in the present case comprising twooppositely and horizontally disposed cylinders 1 and an in-v termediatecrank case 2, is shown. An exhaust manifold, pipe or conduit 3 is boltedto the rear side of the cylinders 1 in: communication with the exhaustports thereof.

A hollow propeller supporting post, muf-v ier and transmission housing5, boltedl or attached at the upper end to the' crank case 2 and exhaustconduit 3 of the engine, is

provided adjacent. its lower end with a gear case 6 and with bearings 7,8 and 9, for a propeller shaft 10 and transmission shaft 11. The shafts10and 11 are connected by bevel gears 13 and 14, enclosed in the case 6,and at its upper end the shaft 11 is connected with the crank shaft ofthe engine in the usual or any suitable manner (not shown).

-A end .of the shaft 10 has its hub formed with an' annularj exhaustpassage 17, .concentric propeller wheel 16, mounted. on the reartherewith andregistering at its front end with` an exhaust outletopening 18 in the rear side -of 'the post 5. The passage 17 iscontracted adjacent its rea-r end to prevent the spreading of theexhaust gases discharged therefromv and' their interfering with theblades', audit is providedwwith oblique 'or v'inclined vanes l19',ladapted when the proproper operation of the propeller peller wheel isrotated',l to draw water and gases from the hollow post and muiiler 5and forcibly rear end of the hub, and thus assist in #the propulsion ofthe b oat ,on which the motor propeller lis mounted.

A bracket .21, comprising clamps 22, which are lprovided Ywith thumbscrews 23 'for detachably fastening it on the back, a

discharge the same from the gunwale or other part of a boat, is formedor provided with transversely aligned frictional pivot ears 24, whichare connected b v Abolts 25, as shown in Figs. 1 and 7,`withcorresponding frictional pivot .ears 26, formed or provided on the crankcase 2 of the engine, so-as to permit the propeller wheel with thesupporting post from which 1t 1s suspended, to be swung 5 and the.engine rearwardly and upwardly for beaching the boat, clearingobstructions or traversing A,shallow4 water. -The bolts 25 are heldagainst turning in the bracket 21 'by engage-l ment of the bolt headswith lugs 27 on the ears 24, as shown in Fig. 7.

Between the ears 24 and 26, friction washers 28 of fiber or othersuitable material, are Y interposed, and the pivot bolts 25 are threadedand provided with nuts 29 for `varying the frictional engagement oftheears with each other or the washers 28 between them, so as to hold themotor propeller in proper working-position under .normal conditions andat the same time to allow the lower end of the post 5 "with thepropeller wheel vto yieldingly swing rearward 'and upward to clearobstruct-ions "which would or might otherwise break or injure theapparatus.

Between the nuts 29 and the ears 24,

A washers 30 are interposed a'nd loosely keyed on the threaded ends ofthe bolts, as shown in Fig. 7 to vprevent the loosening of the I- theboat 'on which the clamp 21 is mounted,

and resists the forward thrust of the propeller wheel against the lowerend of the with the bmket Lugs 3 5,'on the pivot ears 26, by engagementwith a cross piece of the bracket 21, limit the rearward and upwardswing of the motor propeller on its pivot connections 'A rudder 37 ispivoted to' vertically aligned lugs 38 and 39 on the rear side of'vfthe'post 5 and the lower end of a guard .post below"the"'propellerwheel. teY

40 extending from the lower end of the A vertically7r shiftable tiller-or steering head 42,

provided with cross arms 43 for the attachment of"st eering ropes,chains or wires, is plvotally mounted on the rear side of thel post 5above and in alignment "with the 46 is fitte pivot connections of theruddenwith the post.

As shown in Figs. 1,13, 4 and 8, the head 42 is formed withl ears 44 and45, in which a vertical ivot pin 46 is secured. The pin dp to turn andslide-lengthwisejn a lugor sleeve48, which may be conveniently formed ona, flange or plate 49 cfa pump 'barrel or cylinder 50, and bolted orfastened Atherewith to the post 5. The ear 45 or the lower end of thehead 42, is angular or has agstraightl edge on the front side, in a'rasees? Figs. 1 and 3, and permits the head to be drawn Aupwardly out ofengagement with the rudder, as shown in Fig. 4, to permit swinging therudder from operative to 1noperative osition, or vice versa. .v

The sha which engages with and operates the pump plunger 58 forcirculating cooling vwaterthrough the cylinder jackets of the engine. Asuction pipe 60, leading upwardly from an opening intheV rear side ofthe post 5 through the muilier chamber, supplies water to the pump.

The discharge of the pump is connected in the usual or any suitablemanner with the cylinderjackets, for' instance by a. branching pipe59,'and the spent cooling water is discharged from the upper parts ofthe jackets, for instance by pipes (il, as indicated by dotted lines`inFig. 1.

A deflector 62, is provided in the exhaust inlet to the muiller chamberin the post 5 above the pump barrel 50, to prevent the direct impact ofthe exhaust gases against, and the overheating of, the pump.

The post 5 is extended in a fore and a direction to resist the lstrainsto which it is subjected, and to afford a muiiier chamber of suiiicientcapacity, and is preferably formed on the front side with acentral-vertical strengthening rib or fin 64, which with the whe'elguard 40 below the post, and the oblong shape .of the post, as shown inFig.

6, in front" ofthe propeller wheelsmoothly cleaves the water withoutinterfering with the effective operation of the wheel.

' In the operation of the motor propeller, when the engine is startedand the propeller wheel is rotated, water which has entered and risen inthe mulller chamber, is immediately drawn and expelled therefrom throughthe passage 17 the wheel hub by the action of the vanes 19, which thenoperate to expel the exhaust gases discharged -jinto the muffler chamberfrom the engine,

to relieve the engine'of back pressure and to assist in the propulsionof the boat.

- For running in shallow water and :t'orv beaching the boat.A the post 5with the pro peller wheel may be swung-rearwardly and upwardly on thepivot bolts.25, with or without slackening thenuts 29.

In case an obstruction is encountered by the post 5 orvwheel guard 40,which would 11 is provided with a. @am 57,

' inl Fig. 4, and/then swinging it forward ing the motor propeller whenit is removed with the bracket 21 from a boat, the rudder 37 is.disengagedl from the deep groove 52 in the head 42 by lifting the head,as shown against or close to the post, as indicated by dotted'lines inposition' it is locked and held by engagement with the shallow groove 53and by the engagement of the angularear with the flange or pla-te 49, asshown in Fig. 3.

Various modifications in the construction and arrangement of parts oft-he apparatus may be made without departure from the principle andscope ofthe invention as'defined it. the following claims. v

I claim:

1. In a motor propeller thc' combination with an internal combustionengine, of a propeller. vwheel suspended therefrom and having an exhaustpassageextending through its hub adjacent its axis, and a conduitconnected with the exhaust of the engine and having an openingregistering with the passage in the propeller hub.

2. Ina lmotor propeller the combination with an internal combustionengine, of a hollow post attached at its upper end tov the engine incommunication with the exhaust of the engine, and provided adjacent itslower end with an exhaust opening, a,

propeller shaft mounted in the lower end of the post and projectingrearwardly therefrom, a propeller wheel fixed on said shaft and havingan exhaust passage extending through its hub and vregistering with thepropeller wheel having exhaust opening in the ost, and a transmissionshaft geared at lts lower end with the propeller shaft and lconnected atits upper end with the engine.

3. In a motor-propeller the combination with an internal combustionengine of a propeller wheel having an annular exhaust passage extendngthrough its hub and a conduit connecting said passage connected with theexhaust port of the engine.

4. In a motor-propeller the combination with an internal combustionengine of a an annular exhaust passage extending longitudinally throughits hub concentrically with its axis and connected at its front end withtheexhaust conduit of the engine, said passage being provided obliquelyto the axis ofthe propeller wheel with a vane adapted with the rotationof the wheel to force the exhaust Figs. 2, 5 and 8, in whichl gases fromthe engine rearwardly. through the wheelhub.

5. In a motor-propeller the combination with an internal combustionengine of a propeller wheel suspended therefrom and operativelyconnected therewith, the hub of the wheel having a co-axial annularexhaust passage extending longitudinally through it and connected at itsfront end with the exhaust conduit of the engine, said passage having anobliquely disposed vane for inducing a rearward flow therein when thewheel is rotated and being contracted towards its rear end.

6. In a motor-propeller the combinationl with' an internal combustionengine, of a hollow postattached to and depending from the engine incommuncation at its upper .end with the exhaust port of the engine andprovided adjacent its lower end with a rearwardl directed exhaust outletopenin a prope ler shaft carried by the lower end of the post, apropeller wheel mounted on said shaft and having an exhaust passageextending longitudinally through its hub and communicating at its front'end with the outlet opening in the post adjacent the propeller shaft,and transmission gearing connecting the propeller shaft with ltheengine.

7.' In a motor-propeller the combination of a propeller supporting post,a rudder pivoted to the rear side of the post, and a verticallyshiftable steering and locking head pivotally. connected with the postin alignment with the' pivot axis of the rudder and provided in itslower end with intersecting grooves of dierent .depths for engagementwith the upper end of the rudder, said head having a part adapted in anelevated position to engage with a part on the post to hold the head andrudder against turning when the rudder is swung forward close to thepost and engaged with the shallow groove.

8. In a motor-propeller the combination of a propeller supporting post,a rudder pivotedto the rear side of the post, a vertically shiftablesteering and locking head pivotally connected with the post in alignmentwith the pivot axis of the rudder and having, an angular lower endformed with intersecting grooves of different depths for 'engagementwith the upper end of the rudder, a spring tending to shift the headdownward, and a projection on the post with whichthe angular end of rthehead en ages to prevent its turning 'when the rud er is swung forwardand engaged with the shal- 120 lower groove.

In witness whereof I hereto aiiix my

